Ortho-hydroxyazo dyes



Patented May 14, 1935 Signor to General Aniline Works, Inc., New York, N. Y., a corporation of Delaware No Drawing. Application January 28, 1933,

Serial No. 654,109. In Germany April 18, 1932 12 Claims.

My present invention relates to a process for manufacturing valuable new ortho-hydroxyazo dyes and to the products obtainable according to this process. ,I a a I have found that valuable dyes suitable for dyeing wool with the aid of a chromium mordant by the single-batn process areobtainable by diazotizing a Z-amino-l-hydroxybenzene sulionic acid, or a nuclear substitution product thereof and coupling the diazo compound with a benzo- 2,4-dihydroxyquinoline.

The dyes thus obtained are distinguished by their solubility in water and their good affinity for W001. They yield, when dyed on. wool, according to the single-bath process in the presence of a chromium mordant red to'violet tints having a good fastness to fulling and washing and an excellent fastness' to light. 7,8-benzo-2,4-dihydroxyquinoline, suitable as a coupling component, is described-in Berichte der: Deutschen Chemischen Gesel1schaft, vol.' 60 page 841. M 5,6- benzoQA-dihydroxyquinoline can be made a manner similarto that prescribed in Berichte derDeutschen lhemischen Gesellschaft namely, by heating Z-na'phthylamine with malonic acid ester. The production of the 6,7-isomeride is by treatment of acetyl-2,3-aminonaphthoic acid as describeddn German specification No. 117 167; homologues and substitution products of these bodies can'be made from the appropriate parent materials in a manner analogous to that described in the aforesaid publications.

The followingexamples illustrate the invention, the parts being by weight: 0 I

Example 1.--22.4' parts of 4-chloro-2-amino- 1-hydroxybenzeneF6-sulfonic acid are suspended in about 300 parts of water and diazoti zed at 10 C. by addition of parts ofhydrochloric acid of 12 B and 6.9 parts of sodium nitrite. The diazol-compound thus obtained is allowed to run into a cold solution of 23 parts of ZA-dihydroxya-naphtho-quinoline and 20 parts of sodium carbonate dissolved,in about 500 parts of water. When the reaction: has finished, the mass is warmed to {80 C. and the dye is separated by addition offconi mon salt, When dry, it is a dark powder which is easily soluble in water and dyes Woolf red violet tints without the necessity either of preliminary mordanting or after-treatment when carrying out the chromium-mordanting and dyeingcpro'cess'e's: according to the single+ batli processv The shades thus obtained liave agood fastness to milling and washing and an excellent iastness to light.

A similar product is obtainable when starting from 4-chloro-2-amino-l hydroxybenzene-Ev-sulionic acid.

Example 2.Th e diazo compoun d prepared from 23.4 parts of 4-m'tro-2-amino-l-hydroxy benzene-S-sulfonic acid, 6.9 parts of trite and 5 parts of hydrochloric acid sodium ni- (12 B) in about 500 parts of water, is added to a solution of 23 parts of 2,4-dihydroxy-a-naphthoquinoline and 20 parts of sodium carbonate in 500 parts of water which iscooled by ice. worked up as usual. It forms in the The dye formed is dry state a dark powder which is easily soluble in water and dyes wool accordingto the chromium mordanting single-bath process-garnet shades of good fasta.

ness to milling and washing.

Example 3.,22.4= parts of 4-chloro-2-amino-1- hYdIOXYbEIIZQDBrS-SUIIEOIHC acid are suspended in about 300 parts oiwater and after addition of 5 parts of hydrochloric acid of ,12 B are diazotized at C. by addition of 6.9 parts of sodium nitrite.

The finished diazo compound is run into a cold solution of 23 parts of 5.6-benzo-2A-dihydroxyquinoline and Spartsof sodium hydroxide in about 500 parts of waten. When coupling is complete, the dye is worked up in known manner.

When dry, it is a dark powder; it dyes single-bath chrome process violet ti good fastness to washing and fulling.

W0 by. the nts of very Example 4.A diazo compound made from 23.4 parts of 4-nitro-2-amino-l-hydroxybenzene-fisulfonic acid, 6.9 parts of sodium nitrite and 5 parts of hydrochloric acid of 12 B and contained in about 500 parts of water, is added to a solution, cooled with ice, of .23 parts of 6,7-benzo-2,4-dihydroxyquinoline and parts of calcined sodium carbonate in 500 parts of water.

The dye thus produced is salted out; when dry, it is a dark powder which dissolves wellandproduces on Wool by the single-bath" chrome process gar tints of good fastness tov washing and It is obvious that my invention is to the foregoing examples or to the tails given therein.

net colored iulling.

not limited specific deionic acid is one of these component plicable as starting material.

5 bei l- What I claim is:- 1. The ortho-hydroxyazo dyes corresponding to the general formula HO N and X means hydrogen, halogen or N02, said dyes dyeing wool in the presence of a chromium mordan't according to the single-bath process red to violet tints of good fastness to fulling and washing and. excellent fastness to light.

2. The ortho-hydroxyazo dyes corresponding to the general formula wherein R means HON HO N

dyeing wool in the presence of a chromium mordant according to the single-bath process red to violet tints of good fastness to fulling and washing and excellent fastness to light.

3. The ortho-hydroxyazo dyes corresponding to the general formula wherein R means said dyes dyeing wool in the presence of a chromium mordant according to the single-bath process violet tints of good fastness tofulling and washing and excellent fastness to light.

4. The ortho-hydroxyaz'o dye corresponding to the general formula said dye dyeing wool in the presence of a chromiummordant according to the single-bath process violet tints of good fastness to fulling and washing and excellent fastness to light.

5. The ortho-hydroxyazo dye corresponding to the general formula I said dye dyeing wool in the presence of achromium mordant according to the single-bath process red-violet tints of good fastness to fulland X means hydrogen, halogenor N02, said dyes ing and washing and excellent fastness to light. 7

6. The ortho-hydroxyazo to the general formula said dye dyeing wool in the presence of a chrodye corresponding mium mordant according to the single-bath process violet tints of good iastness to fulling and washing and excellent fastness to light.

'7. The process which comprises diazotizing a l-hydroxy-2-aminobenzene mono-sulfonic acid and coupling the diazo compound with a. benze- 2,4-dihydroxyquino1ine.

8. The process which comprises diazotizing a 1-hydroxy-2-aminochlorobenzene mono-sulfonic acid and coupling the diazo compound with a benzo-2,4-dihydroxyquinoline.

9. The process which comprises diazotizing a l-hydroxy -;2 amino-4-chlorobenzene-6-sulfonic acid and coupling the diazo compound. with a benzo-2A-dihydroxyquinoline.

10. The process which comprises diazotizing V 1- hydroxy-2-amino-4-chlorobenzene- 6 -sulfonic acid and coupling the diazo compound with 6,7-benzo-2,4-dihydroxyquinoline.

11. The process which comprises diazotizing 1- hydroxy-2-amino-4-ch1orobenzene- 6 -sulfonic acid and coupling the 'diazo compound with 7,8-benzo-2,4-dihydroxyquinoline.

12. The process which comprises diazotizing 1- hydroxy-2-amino-4-chlorobenzene- 6 -sulfonic acid and coupling the diazo compound with 5,6-benzo-2, i-dihydroxyquinoline.

WALTHER BENADE. 

